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    Wyświetlanie 1-8 z 8
    Tytuł:
    Recurrence relations for a multi-channel closed queueing system with Erlangian service times of second order
    Autorzy:
    Zhernovyi, Y.
    Kopytko, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/122441.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    multi-channel closed queueing system
    Erlangian service times of second order
    fictitious phase method
    recurrence relations
    system kolejkowania
    zależności rekurencyjne
    Opis:
    We propose a method for determining the steady-state characteristics of a multichannel closed queueing system with exponential distribution of the time generation of service requests and the second order Erlang distributions of the service times. Recurrence relations to compute the steady-state distribution of the number of customers are obtained. The developed algorithms are tested on examples using simulation models constructed with the assistance of the GPSS World tools.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2017, 16, 3; 123-128
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the efficiency of the delivery process in the technical object of transport infrastructure with the application of a simulation model
    Autorzy:
    Zabielska, Aleksandra
    Jacyna, Marianna
    Lasota, Michał
    Nehring, Karol
    Powiązania:
    https://bibliotekanauki.pl/articles/24200792.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    process efficiency
    mass service system
    technical object reliability
    multi-element systems simulation
    FlexSim simulation
    Opis:
    The article presents the issue of assessing the effectiveness of the implementation of a logistics process with the use of a simulation model and queue theory. The process that has been analyzed is the process of goods’ delivery at the technical object. Firstly, a literature review was carried out. Next, the authors described the process using the QT (Queueing Theory). This was possible due to the fact that QT is widely used in the analysis of systems as well as the assessment of their effectiveness, maintenance, and reliability. The description, characteristics and graphic presentation of the system in which the process is carried out have been included in the study too. Then the process was implemented in the computer simulation environment. Simulations were carried out and four variants of the system operation were analyzed. The comparison of the operating parameters of the system for each variant allowed for a detailed analysis of its operation and the influence of selected factors on the implementation of the process as well as it effectiveness or reliability.
    Źródło:
    Eksploatacja i Niezawodność; 2023, 25, 1; art. no. 1
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    G4 Multi-constellation Precise Point Positioning service for high accuracy offshore navigation
    Autorzy:
    Tegedor, J.
    Ørpen, O.
    Melgård, T.
    Łapucha, D.
    Visser, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/115985.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Navigation Satellite Systems (GNSS)
    high accuracy offshore navigation
    Precise Point Positioning (PPP)
    Integer-Ambiguity Resolution (IAR)
    G4 system architecture
    Multi-constellation Precise Point Positioning Service
    offshore navigation
    positioning accuracy
    Opis:
    Fugro is operating a global GNSS infrastructure for the delivery of high-accuracy multi-constellation Precise Point Positioning (PPP) service, named G4. Precise orbit and clock for all global satellite navigation systems are estimated in real-time and broadcast to the users using geostationary satellites. End-users with a G4-enabled receiver are able to obtain sub-decimeter positioning accuracy in real-time. The system has been tailored for offshore applications where a nearby GNSS station is not always readily available. G4 offers seamless integration of GPS, GLONASS, Galileo and BeiDou in the navigation solution, therefore allowing the user to obtain a reliable and accurate position even in challenging environments, especially in presence of interference, scintillation or partial sky visibility. In addition, carrier-phase integer-ambiguity resolution (IAR) is supported, for those users requiring the highest possible navigation accuracy. This paper presents the G4 system architecture and current performance. The benefits of multi-constellation Precise Point Positioning (PPP) are shown in terms of increased availability, robustness and accuracy.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 3; 425-429
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The New Analytical Model of Free Resources in the Limited Availability Resources
    Autorzy:
    Nowak, Błażej
    Stasiak, Maciej
    Zwierzykowski, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/27312948.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    analytical modeling
    limited-availability group
    multi-service system
    networks
    Opis:
    The article presents a new analytical model for determining the probability of availability of a certain amount of well-defined free resources (e.g. a link) in a group of dedicated resources (e.g. a group of links) jointly serving a mixture of different classes of multiservice traffic. The presented method can be used to model access to resources in data centers, in particular in the software-defined networks, assuming – for reliability reasons – that the user should have access to a certain minimum number of specific separated resources. The proposed analytical model was verified by appropriate simulation experiments, which confirmed the satisfactory accuracy of the results obtained.
    Źródło:
    Journal of Telecommunications and Information Technology; 2023, 4; 102--107
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implementation of e-Navigation strategies for RIS centres supporting inland navigation
    Autorzy:
    Lisaj, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/117161.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    inland Navigation
    e-Navigation
    e-Navigation srategy
    maritime navigation cloud
    river information service (RIS)
    multi-functional communication system
    implementation of e-Navigation strategy
    inland ECDIS
    Opis:
    The article presents at e-Navigation strategy and implementation plan for RIS centres supporting inland navigation. The author describes the RIS centre system architecture and modules collaborating in the process of data transmission based on e-Navigation technologies. The functional requirements of e-Navigation strategies for distress communications procedures and ensuring the safety of inland navigation in compliance with the EU directives are described. The components of e-Navigation, which integrate state-of-the-art satellite and terrestrial radio communications systems in the process of effective and efficient management of navigational data transmission, are presented. The feasibility of implementation of e-Navigation strategies for the Multifunctional Communication System integrating digital and analog data processing systems in maritime and inland navigation are analysed. A technological model of the Maritime Navigation Cloud supporting data exchange in the e-Navigation system is put forward.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 1; 145-149
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of the Multiservice Erlangs Ideal Gradings
    Autorzy:
    Hanczewski, S.
    Kmiecik, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/308103.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    Erlang's Ideal Grading
    multi-service system
    traffic engineering
    Opis:
    The design and optimization process of modern telecommunications networks is supported by a range of appropriate analytical models. A number of these models are based on the Erlang’s Ideal Grading (EIG) model, which is a particular case of non-full-availability groups. A possibility of the application of the EIG model results from the fact that telecommunications systems show properties and features distinctive to non-full-availability systems. No detailed studies that would decisively help determine appropriate conditions for the application of the EIG model for modeling of other non-full-availability groups, that would be models corresponding to real telecommunications systems, have been performed. Therefore, this article attempts to find an answer to the following question: what are the prerequisite conditions for the application of the EIG model and when the model can be reliably used?
    Źródło:
    Journal of Telecommunications and Information Technology; 2016, 1; 37-43
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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